Double lumen catheter insert



FIG. 1 is a top view of the double lumen catheter insert, with tubes shown in broken away lines indicating an indeterminate length of the tubes,

FIG. 2 is a front view thereof,

FIG. 3 is a side view thereof,

FIG. 4 is a back view thereof,

FIG. 5 is a bottom view thereof, and

FIG. 6 is an enlarged side view thereof, with the cap removed. 

The ornamental design for a double lumen catheter insert, substantially shown and described. 